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NCP1234

更新时间： 2024-11-29 11:58:47

品牌	Logo	应用领域
安森美 - ONSEMI		转换器控制器
页数	文件大小	规格书
33页	284K
描述
Fixed Frequency Current Mode Controller for Flyback Converters

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NCP1234 数据手册

NCP1234

Fixed Frequency Current

Mode Controller for Flyback

Converters

The NCP1234 is a new fixed−frequency current−mode controller

featuring Dynamic Self−Supply (DSS). This device is pin−to−pin

compatible with the previous NCP12xx families.

http://onsemi.com

The DSS function greatly simplifies the design of the auxiliary

supply and the V capacitor by activating the internal startup current

source to supply the controller during transients.

SOIC−7

CASE 751U

Due to frequency foldback, the controller exhibits excellent

efficiency in light load condition while still achieving very low

standby power consumption. Internal frequency jittering, ramp

compensation, and a versatile latch input make this controller an

excellent candidate for converters where components cost is the key

constraints.

It features a timer−based fault detection that ensures the detection of

overload independently of an auxiliary winding, and an adjustable

compensation to help keep the maximum power independent of the

input voltage.

MARKING DIAGRAM

34Xff

ALYWX

34Xff = Specific Device Code

X = A or B

Finally, due to a careful design, the precision of critical parameters

is well controlled over the entire temperature range (−40C to

+125C).

ff = 65 or 100

= Assembly Location

= Wafer Lot

= Year

= Work Week

= Pb−Free Package

Features

 Fixed−Frequency Current−Mode Operation with Built−In Ramp

Compensation

 65 kHz or 100 kHz Oscillator Frequency version

 Frequency Foldback then Skip Mode for Maximized Performance in

Light Load and Standby Conditions

PIN CONNECTIONS

Latch

 Timer−Based Overload Protection with Latched (option A) or

Auto−Recovery (option B) Operation

GND

DRV

 High−voltage Current Source with Dynamic Self−Supply,

(Top View)

Simplifying the Design of the V Capacitor

 Frequency Modulation for Softened EMI Signature, including during

Frequency Foldback mode

 Adjustable Overpower Compensation

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 32 of this data sheet.

 Latch−off Input for Severe Fault Conditions, Allowing Direct

Connection of an NTC for Overtemperature Protection (OTP)

 V Operation up to 28 V, with Overvoltage Detection

 500 mA Peak Source/Sink Current Drive Capability

 4.0 ms Soft−Start

 Internal Thermal Shutdown

Typical Applications

 AC−DC Adapters for Notebooks, LCD, and Printers

 Offline Battery Chargers

 Pin−to−Pin Compatible with the Existing NCP12xx

Series

 Consumer Electronic Power Supplies

 Auxiliary/Housekeeping Power Supplies

 These Devices are Pb−Free, Halogen Free/BFR Free

and are RoHS Compliant

 Semiconductor Components Industries, LLC, 2011

Publication Order Number:

October, 2011 − Rev. 1

NCP1234/D

12 3 4 5 6 7...33

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NCP1235AD065R2G	ONSEMI	获取价格	Fixed Frequency Current Mode Controller
NCP1236	ONSEMI	获取价格	Fixed Frequency Current Mode Controller for Flyback Converters
NCP1236AD100R2G	ONSEMI	获取价格	Fixed Frequency Current Mode Controller for Flyback Converters
NCP1236AD65R2G	ONSEMI	获取价格	Fixed Frequency Current Mode Controller for Flyback Converters

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